Aqua Mira now comes with a tiny mesh filter that fits conviently over the mouth of a Platypus Resevoir. The mesh filter is fine enough in the webbing that it will take out paticles an such. I too had some reservations at first with no way of filtering the little things until that was introduced. I use a Sechle in line for my hydration while hiking and for in camp purposes I use Aqua Mira because I have plenty of time to wait for the chemicals to activate. Hope that helps.